Re: MSD distributor timing curves
[Re: A/MP]
#2454535
02/20/18 01:38 PM
02/20/18 01:38 PM
|
Joined: Oct 2011
Posts: 3,036 bean town ....Ca
WHITEDART
master
|
master
Joined: Oct 2011
Posts: 3,036
bean town ....Ca
|
Locking out the distributor will make your car run more consistent. I agree and probably will make it 60 foot faster
In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb
|
|
|
Re: MSD distributor timing curves
[Re: justinp61]
#2454557
02/20/18 02:34 PM
02/20/18 02:34 PM
|
Joined: Sep 2006
Posts: 1,132 Home of the Bluegrass
MoparJunkie
super stock
|
super stock
Joined: Sep 2006
Posts: 1,132
Home of the Bluegrass
|
What I found was the bushings all allowed to much advance for the initial that my engine needed. My engine ran best with 34° total and liked 22° initial. If I set the total timing it wasn't happy at idle and if I set it at idle it had way to much total.
There was a member here that made custom bushings so I bought one and sanded it down to get the right amount of advance. It's been years ago and I can't remember who it was. Crackedback is who you're looking for. I bought a 10* bushing from him. Works great for my 22 initial and 32 total on the 472 hemi... Or at least I'm somewhat sure that's what his name is?!?!?!?!?!
Last edited by 70HemiShaker; 02/20/18 02:35 PM.
"It takes a Mopar to catch a Mopar” 1971 Roadrunner FJ6 Sassy Grass 505"RB, 18 spline 4 speed, and Dana 60 with 3.54 2022 Hellcat Charger Widebody Redeye Jailbreak: Hellraisin with 8 speed auto
|
|
|
Re: MSD distributor timing curves
[Re: MoparJunkie]
#2454569
02/20/18 02:45 PM
02/20/18 02:45 PM
|
Joined: Oct 2003
Posts: 11,685 W. Kentucky
justinp61
I Live Here
|
I Live Here
Joined: Oct 2003
Posts: 11,685
W. Kentucky
|
What I found was the bushings all allowed to much advance for the initial that my engine needed. My engine ran best with 34° total and liked 22° initial. If I set the total timing it wasn't happy at idle and if I set it at idle it had way to much total.
There was a member here that made custom bushings so I bought one and sanded it down to get the right amount of advance. It's been years ago and I can't remember who it was. Crackedback is who you're looking for. I bought a 10* bushing from him. Works great for my 22 initial and 32 total on the 472 hemi... Or at least I'm somewhat sure that's what his name is?!?!?!?!?! I believe you're correct.
|
|
|
Re: MSD distributor timing curves
[Re: 68DART360]
#2454573
02/20/18 03:01 PM
02/20/18 03:01 PM
|
Joined: Oct 2015
Posts: 192 Gravataí, RS, Brazil
360tripleblack77
member
|
member
Joined: Oct 2015
Posts: 192
Gravataí, RS, Brazil
|
I'm running with 24° initial and 36° total timing. 12.0:1 CR, Eddy Heads, 95 octane pump gas and 30% of ethanol.
When I ran on dyno, engine loved 26° initial and 38° total timing But last time that I ran at Track was very hot and I just keep 24° and 36°.
'77 Brazilian Dodge Charger R/T - Street Car Footbrake, Pump Gas, SB Mopar 360" N/A 3300lbs, Leaf Spring + Assassin Bars Best 1/8 mile ET 1.50 60' / 4.31 330' / 6.73@102.54mph
|
|
|
Re: MSD distributor timing curves
[Re: A/MP]
#2454581
02/20/18 03:19 PM
02/20/18 03:19 PM
|
Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
|
I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
|
Locking out the distributor will make your car run more consistent. Yep,
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
|
|
|
Re: MSD distributor timing curves
[Re: 68DART360]
#2454621
02/20/18 04:01 PM
02/20/18 04:01 PM
|
Joined: Aug 2003
Posts: 43,284 Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,284
Bend,OR USA
|
Most SB on gasoline don't need or like a lot of total advance, all the ones I've helped like 30 to 32 total. On your deal I would shoot for 14 to 18 at idle and 32 degrees total (make sure and test at 30 to 36 in two degrees increments due to the difference in timing marks on the balancer and timing covers and the differences in timing lights used on MSD ignitions to find out what your numbers need to be to run the fastest with your car ) above 1500 RPM Good luck, let us know later what yours works the best with
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: MSD distributor timing curves
[Re: 68DART360]
#2454627
02/20/18 04:07 PM
02/20/18 04:07 PM
|
Joined: Dec 2005
Posts: 11,668 Fulton County, PA
CMcAllister
Mr. Helpful
|
Mr. Helpful
Joined: Dec 2005
Posts: 11,668
Fulton County, PA
|
I've fooled around making bushings and fooling around with curves on street driven stuff. Anything with a decent cam and converter, lock it out. Or just put a crank trigger on it. If you really need or want to control a timing curve, do it electronically.
If the results don't match the theory, change the theory.
|
|
|
Re: MSD distributor timing curves
[Re: 68DART360]
#2454640
02/20/18 04:38 PM
02/20/18 04:38 PM
|
Joined: Nov 2015
Posts: 883 Missouri
jwb123
super stock
|
super stock
Joined: Nov 2015
Posts: 883
Missouri
|
back in the day it was trial and error, now I use performance trend engine analizer software, it calculates an advace curve for what ever octane fuel you want to run. Like most programs garbage in garbage out, but if you take the time to be accurate with the info it works good. I just did a procharged 410 mopar with a fitech, calculted the advance curve with and with out boost imputed the numbers into the Fitech computer as a starting point for the ignition advance, it ran great. I am running 6 lbs of boost on pump gas. When I decide to change pulleys and good gas, will calculate again and see what happens.
Last edited by jwb123; 02/20/18 04:39 PM.
|
|
|
Re: MSD distributor timing curves
[Re: Dave Hall]
#2454650
02/20/18 05:02 PM
02/20/18 05:02 PM
|
Joined: Dec 2005
Posts: 11,668 Fulton County, PA
CMcAllister
Mr. Helpful
|
Mr. Helpful
Joined: Dec 2005
Posts: 11,668
Fulton County, PA
|
Just make sure all the timing is in by 3,000rpm and check it at 3,000rpm or above. I wouldn't run more than about 34 total. Right. With light springs, it's in by 12-1500. My reasoning is most engines - that aren't bone stock - are above 3k before they move off the spot. Why not just lock it out, and take advantage of the improved and stable idle, throttle response and carb function? I'm talking carburated drag racing.
If the results don't match the theory, change the theory.
|
|
|
Re: MSD distributor timing curves
[Re: justinp61]
#2454663
02/20/18 05:15 PM
02/20/18 05:15 PM
|
Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
|
master
Joined: Sep 2014
Posts: 4,457
Washington
|
For the guys running 34-36° timing locked out are there any hot start issues? My car is a street/strip and I don't want to have to deal with hard hot starts. What ignition are you running? Most of them have some kind of start retard, and most of them you can adjust the amount of retard.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
|
|
|
Re: MSD distributor timing curves
[Re: 68DART360]
#2454665
02/20/18 05:20 PM
02/20/18 05:20 PM
|
Joined: Feb 2015
Posts: 2,080 CA
crackedback
top fuel
|
top fuel
Joined: Feb 2015
Posts: 2,080
CA
|
Yep, I have the bushings in 10 and 14 degree sizes. $10 each plus shipping Thanks 70HemiShaker. Glad it worked as advertised for you. IMO, let the engine tell you what it wants for idle timing. Even stock 340's like 14-16 which is way more than most people think considering the factory started at 10 and dialed it back later for emissions. Simple test, get it warmed up and idling, twist the dist a smidge CCW, if it picked up RPM, the engine wants the timing. Reset idle speed and do it again. You'll find the happy place. It may not want to start with the point it's happiest, bit of a balancing act. Won't start dial it back to where it will when hot. Locking it out is another consideration, make sure you have good battery cables...
|
|
|
|
|